104+ a powerful synthetic cleaner that helps to improve acceleration; clean fuel injectors and the entire fuel system. It helps to restore lost engine horsepower with 1 use. Helps to reduce knocks, pings, hesitation, and stalling. Improves gas mileage. Not harmful to spark plugs, catalytic converters, and OBD oxygen sensor sytems. Add 1 oz. to every gallon of gasoline. 16 oz. bottle.